<!DOCTYPE HTML>
<html lang="en">
	<head>
		<title>three.js - grass</title>
		<meta charset="utf-8">
		<style type="text/css">
			body {
				background:#030;
				color:#fff;
				padding:0;
				margin:0;
				overflow:hidden;
				font-family:georgia;
				text-align:center;
			}
		</style>
	</head>

	<body>
		<script type="text/javascript" src="../build/Three.js"></script>
		<script type="text/javascript" src="../src/extras/primitives/Plane.js"></script>


		<script type="text/javascript">

			var camera, scene, renderer,
			mesh, levels = [];

			init();
			setInterval( loop, 1000 / 60 );

			function init() {

				camera = new THREE.Camera( 60, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.y = 75;
				camera.position.z = 100;

				scene = new THREE.Scene();

				var geometry = new Plane( 100, 100 );

				var texture = generateTextureBase();

				for ( var i = 0; i < 10; i ++ ) {

					mesh = levels[ i ] = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { map: new THREE.Texture( generateTextureLevel( texture ), new THREE.UVMapping(), THREE.ClampToEdgeWrapping, THREE.ClampToEdgeWrapping ) } ) );
					mesh.rotation.x = - 90 * ( Math.PI / 180 );
					mesh.position.y = i * 0.5;
					scene.addObject( mesh );

				}

				renderer = new THREE.WebGLRenderer();
				renderer.sortObjects = false;
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

			}

			function generateTextureBase() {

				var canvas = document.createElement( 'canvas' );
				canvas.loaded = true;
				canvas.width = 1024;
				canvas.height = 1024;

				var context = canvas.getContext( '2d' );

				for ( var i = 0; i < 20000; i ++ ) {

					context.fillStyle = 'rgba(0,' + Math.floor( Math.random() * 64 + 32 ) + ',16,1)';
					context.beginPath();
					context.arc( Math.random() * canvas.width, Math.random() * canvas.height, Math.random() * 3 + 1, 0, Math.PI * 2, true );
					context.closePath();
					context.fill();

				}

				context.globalAlpha = 0.1;
				context.globalCompositeOperation = 'lighter';

				return canvas;
			}

			function generateTextureLevel( texture ) {

				texture.getContext( '2d' ).drawImage( texture, 0, 0 );

				var canvas = document.createElement( 'canvas' );
				canvas.loaded = true;
				canvas.width = texture.width;
				canvas.height = texture.height;

				canvas.getContext( '2d' ).drawImage( texture, 0, 0 );

				return canvas;

			}

			function loop() {

				var time = new Date().getTime() / 6000;

				camera.position.x = 100 * Math.cos( time );
				camera.position.z = 100 * Math.sin( time );

				for ( var i = 0, l = levels.length; i < l; i ++ ) {

					mesh = levels[ i ];
					mesh.position.x = Math.sin( time * 4 ) * i * i * 0.02;
					mesh.position.z = Math.cos( time * 6 ) * i * i * 0.02;

				}

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
